Requesting the RDF MIME type of an image

Hello there,

I'm researching into the semantic analysis of complementary resources  
right now, and I'm about to start work on an automated image annotator.

I have got to the stage of my RDF file being generated and I'm now  
trying to figure out a way for the user or their application to  
retrieve the RDF version of the image.

I have found a couple of helpful things from [ http://www.w3.org/TR/photo-rdf/ 
  ];

"The RDF can be also be fetched directly without doing Content  
Negotiation, by just adding the wanted MIME type after a semicoln (;)  
e.g.: foo.jpg;application%2Frdf+xml ("%2F" is "/", escaped for  
occurrence in a URL.)"

This doesn't work for me on the image set [ http://jigsaw.w3.org/Yves/Australia/1998/04/ 
  ] which are supposed to support RDF metadata.

I also saw somewhere that you can actually embed the RDF data inside a  
COM comment in the image too.

*** There's not much else to dig around in on this topic by the looks  
of things, could anyone give me a pointer?

Many thanks,
Dan Smith